Adjustable boring-bar holder



July 10, 1928. 1,676,937

v E. E. VIDARSHOF ADJUSTABLE BORING BAR HOLDER Original Filed Feb. 17, 1925 2/3 INVENTOR.

7 l8 {4 Eric E I/Idars/Mf, VQZ/TNZES. /& BY

u g LATTORNEYJQ- m E. vinaasliorlo wssr rii ls oltsiu i I .anqusranri nonme nan Kenn-En."

f tlis a r le sb rr .9. 3; "Se i 9- me zj -qse jee' ap 25, 1925:

In devices of this classit is desirable that e range 1 wristser u he; h we ting tool which is supported'by the bar may construction enables me to effect a practibe accurately and firmly positioned with re spect to. the work and that there be nolimitatio'n 'upon' such adjustment in order that all demands thereon may be met. My improved cally universal adjustment, and this is accomplished readily by reason of the construction which I employ.

My improved device is adapted to be sup ported in the tool post "of any ordinary'lathe, and is capable of precise adjustment both vertically and radially with relation to the work, so that the cutting tool may be positioned for operation at any desired point.

I Thus component adjustment of the cutting tool at any point between the extremes of the radial and vertical adjustment may be secured. V

The invention will be described in detail and the novelty thereof will be pointed out in the appended claims.

Referring to the drawing:

Figure 1 is a perspective view, showing the construction of my improvement and the manner in which the same is used in operating upon a piece of work rotated by, the, lathe head.

Fig. 2 is a plan view of my invention.

Fig. 3 is a cross sectional view on. the irregular line 3-3, Fig. 2, looking in the direction of the arrows.

In the drawing, the numeral 10 indicates the tool post supported on the slide rest 11 of a lathe. The boring bar holder is composed of two parts 12 and 13, the latterbeing formed as a clamp for supportmg the bar 1 1. The head of the part 12 is constructed with a branch 15 which'lies parallel with the clamp member 13 and with a branch 16 which latter 'is adapted to be set in the tool post. The head of the part 12 at the juncture of the branches is perforated for the reception of a cap screw 17, which is threaded into the clampmember 13, and which forms a pivotal point for vertical adjustment of the clamping member 13. 7

Near its free end the branch 15 is provided with a transversely extending slot 18, through which is passed a cap screw 19 likewise threaded into the clamping member 13, and which is adapted to hold the clamping member and the boring bar carried thereby the exact in 5 adjusted .vertical position.

thework is effected through rota-tionf of'tlie i postupo'n the slide rest 11. The provisionsfo'rf radial vertical adjustment-Q thus described will enab'le'-" the *c'uttingtool I Radial d-f, f ustment' or the boring bar witlire'laition to 20 carried by the bar 14 to be adjusted at point desired with relation to the work.

The clamping member .13 is bored from I for the reception. of the bar 14,.

end to end and is provided wi th a radialslit 21 leading from the bore to its opposite side. Lugs 22 and 23 extend outwardly of the slit set screw 24 passed through a perforation in the lug 22 and threaded into thelug 23,

exerts a binding pressure upon the. bar 1 1' to hold the latter in'longitudinally adjusted position, and prevent rotation thereof under pressure. exerted upon the cutting tool carried by the said bar. 9 f

The boring 1 bar 14 is provided )with' a transverse openingat one end, and with a diagonal opening. at the other, for the reception of cutting tools, which latter may be secured 1n fixed position in the said openings by means of theusua-l set screws.

' The invention is economical in construction, readily adjusted to various positions for work, and When adjustment is effected, the parts are firmly held against displace-; ment.

'ment, the said supporting member being providedwith a branch whereby the boring bar holder is supported'in position for'operation.

2.,A boring bar holder comprising a clamp for the bar and a 'supporting'member upon which the bar is pivoted for vertical adjustment, the supporting member 'being formed with two branches, one of which ex:

tends parallel withthe clamping member,

21, anda Having thus described my invention,.'wha t I I claim and desire .to secure by Letters Pat- 7 in). v

and means fdreciiring the clamliing meme ber in adjusted vertical position upon the said first branch, the second branch of the supporting member constituting the ineans' whereby the boring bar is supported inposition for Work. 3. A boring bar 'holder eomprising av clamping member bored longitudinally for the reception of the bar and .provided with a slit;- extending radially from the bore;

means for clampingthebar in longitudigj nally adjusted pos tion and against rotation,

a npp r g m b po wh h he amping member is .pivo ted,- the said supporting clamping member and transversely slotted V r'or'the receptionof a screw threaded in the clamping member, whereby vertical adjustmentofithe boring bar is secured, theother branch of the supporting member constituting the means for holding theboring .bar inwposition for work. :7

In testimony hereofl v 7 name at Milwaukee, th is 6th day offFebru: ,1923- f l signed my 7 I E ETYiDARSHQII-" j 

